Piston



Sept. 29, 1925. 1,555,606

A. PONDELICK PISTON Filed June 15, 1923 Patented Se t. 29,

U ITED STATES anon renames, or omcaeo, more;

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a umm ma June it, me. mm as mm.

To all whom it concem: Be it known-that I, 'Ax'rox Poxonmcx, a citizen of the United States, and a resident of Chica in the county of Cookand State 6 of Illinois, have invented certain new and useful Improvements in Pistons, of which the following is a specification.

My invention relates to pistons, particularly to pistons for explosive engines. My invention refers to that type of pistons in which the piston bod is constructed of some light material suc as aluminum or aluminum alloy, and wearing rings or hands of heavier metal such as cast iron are associated with thebody to take u the wear while the piston travels in the cy inder. The important object of my invention is to provide improved construction and arrangement for intimately interconnecting the bearing bands with the piston body to prevent such displacement of the bands as mi ht tend to wear away the metal of the body, and also to prevent rattling of the hands during the rapid reciprocation of the piston, my improved arrangement causing .the bands to wear uniformly and with the least friction, and causing the engine to operate noiselessly and efliclentl v The features of my invention are incorporated in the. structure shown on the accompanying drawing, in which- Fig. 1 is a side elevational view of a iston structure part1 in vertical'diametra section showing t e bearing band thereon.

Fig. 2 is a plan view of the bearing band structure partly in section, on plane 22, Fig. 1, and

ig. 3 is a sectional view on plane 33,

The body 10 of the piston structure has the radially extending aring lugs 11 for journaling the connectm rod wrist pin (not shown). The bod is 0 aluminum or other light weight meta and at its upper end has the usual peripheral notches 12.for piston or packing rings. Near its lower end the body has the rectangular external groove or channel 13 which extends entirely around the body and receives the bearing ring 14. 50 At its" inner side the bearing ring has the upper and lower peripheral grooves 15 and 16 and the transverse rooves 17. The bearing ring is laced in t e mould for the body art and ten when the aluminum is cast mto the mould it will enter the grooves 15 and 16 in theform of annular tongues 18 and 19 and this tongue and groove engagement securely locks the ring inst vertical displacement on the body. e metal also enters the transverse grooves 17 so that the ring 18 locked against rotational movement on the piston body.

The bearing ring has the external circumferential channel 20 for receivin the packm ring 21 which is usually in t e form of 63 a gplit ring so that it may be readily applied. The channel 20 may be formed 1n the ring before it is applied-to the piston body or, a solid can be secured m the piston bod and the channel 20 then cut 79 therein. he cutting may be of sufiicient depth to extend a distance through the transverse grooves 17 to leave openm 22 in the ring wall through which the a uminum will be exposed in the channel 20. During the unequal expansion of the aluminum and cast iron as the temperature changes these openings 22 will permit the aluminum to be relieved of its expansion and contraction strains and will keep these strains from the ring. The longitudinal grooves 15 and 16 and the transverse-grooves 17 will km the ring accurately seated in the channe 13 and will revent displacement thereof so that it will alwa s travel .5 smoothl and accurately ainst t e cylinder wal s with minimum 'ction and uniform wear.

I do not desire to be limited to the exact construction and arrangement shown and described as chan and modifications can be made which will still come within the scope of the invention.

I claim as follows:

' L 1. In a piston structure, the combination of the cylindrical body having a circumferential channel of rectangular cross section, a bearing ring fitting in said channel, said bearing ring having longitudinal and transverse fgrooves on its inner side, and extensions om the cylindrical wall of said channel engai'ngmil said grooves to lock the ring to t y..

2. In a piston structure, the [combination of the cylindrical piston wall having a circumferential channelof rectangular cross section, a bearing ring in said channel, an annular groove in the inner 'face of said rin transverse grooves in the inner face of sai rings, and tongues on said body engag-' 1 {:51 in said grooves to lock said ring to the 3. In a piston structure, the combination of the c lindrical body having a circumferential clzannel of rectangular cross section, said body being of cast metal, a bearing ring fitting in said channel, saidring having an annular oove on its innerside adjacent each ge thereof and having transverse grooves, the metal of the body filling said grooves during casting to form tongues for coo lock sald ring with said body.

4. In a iston structure, the combination of the cylindrical body having a 'circumferential channel, a bearing ring fitting in said channel, said rin 'havmg internal circumferentially exten ing grooves adjacent its edges, said ring having an external channel for receivin a packing ring, there being holes through t e base of said channehiand 20 tongues on said body for engaging in said rating with said grooves. to inter grooves and holes interlock said ring with said body. a

5. In a iston structure, the combination of the cy indrical body formed of cast aluminum and having a circumferential channel of rectan ular cross section, a bearing ring of cast 1ron for engaging in said channel,,said ring having an external channel for receiving a packing rin circumferentiall extending grooves'on t e inner side of sai ring near lts edges and holes through the ring base between said grooves, said ring being placed in the mould for the piston so that the cast aluminum will securely engage in said grooves and in said holes to securely interlock said ring with the body.

In witness whereof, I hereunto subscribe my name this 6th day of June A. D., 1923.

ANTON PONDELIGK. 

